Automatic feeder for tools.



PATBNTED FEB. 12, 1907.

' G. T. GARNAHAN & J. MURPHY. AUTOMATIC FEEDER FOE TOOLS.

APPLICATION FILED JULY 31, 1906. i ZSHEETS-SHEET 1.

/42 j? I Ji gff n Edi fizwezzm 5%w7Z6 5LZ wrzzw an PATENTED FEB412, 1907. c. T. GARNAHAN & J. MURPHY.v AUTOMATIC FEEDER FOR TOOLS.

APPLIOAIION FILED JULY 31, 1906.

2 SHEETS-:SEBEI 2 eizfw" ZZZ? \\\\\\H QM d M J g 4 1 r 59 z CHARLES TINGLEYYCARNAHAN AND JEREMIAH MURPHY; or DENVER,

COLORADO; SAID MURPHY ASSIGNOR TO SAID OAR NA HAN.

AUTOMATlC, FEEDER FOR TOOLS.

To all whom it may concern:

Be it known that we, CHARLES T. CARNA- HAN and JEREMIAH MURPHY, citizens of the United States, residin at Denver, in the county of Denver and State of Colorado,

have invented new and'useful Improvements 1 in Automatic Feeders for Tools, of which the following is a specification.

This invention relates to automatic .feeding devices for hand-tools, more particularly to that class termed pneumatic tools, and

aims to provide a feeder in a manner as hereinafter set forth which is arran' edin such relation with respect to the tool t at the tool will be'forced against its work by the feeder,

and at the same time the tool can be freely rotated without twisting or straining the air connection between the tool and the feeder or the air-supply connection tothe feeder.

The invention-further aims to-provide an automatic feederfor the purpose set forth .with means for indicating to theoperator that the feeder is about to the-limit of its operative stroke, said means releasing the compressed air, so that the o erator can readily push back the piston o the'feeder.

The inventionfurther aims to provide the feeder with means for locking the piston thereof at the limit of its stroke in one direc-- tion, thereby preventing the air forcing the piston entirely from its cylinder.

The invention further aims to provide a feeder and means for establishing communication between it and the tool, causing there.- by a su ply of motive fluid to and the'operation o thetool.

' The invention further aims to provide an automatic. feeder for the purpose set forth which shall befsimple in its construction,

' automatic in its action, and inexpensive to strong, durable, portable, efficient in its use,

' manufacture.

With the foregoing and other objects in view the invention consists in the novel construction, combination, and arrangement of parts hereinafter more specifically described, and illustrated in the accompanyin drawment of the-invention; but-it is to be understood that OllfillgQSAVflI'ldtlOIlS, and modifi- .cations can be resorted to which come within the scope of the claims hereunto appended.

In describing the invention in detail ref- Specification of Letters Patent. Application-filed July-31,1906. Serial No. 328,595-

views,- and Patented Feb. 12, 1901' erence is had to the accompanying drawings,

wherein like reference characters denote correspondin parts. throughout the several in which i Figure 1 is an elevation of an automatic feeder in accordance with this invention,

showing the same coupled up to a pneumatic tool. Figs. 2 and 2 when taken toget-her illustrate a sectional elevation ofthe. feeder coupled with the tool, and Fig. 3 isa; transverse section on line 3 3.

Referring to the drawings by. reference characters, 4 denotes an elongated tube constituting the body portion'of the feeder and 1 is termed a cylinder. One end of the cylinder 4 is interiorly'screw-threaded for receiving the tailpiece 5, the latter being shouldered, as at 6, to enable the tailpiece 5 to abut against the end ofthe' cylipder, as I shown in Fig. 2 Projecting frbm the shouldered ortion of the tailpiece 5 is a screw-three ed extension 7, which engages with the interior screw-threads of the cyl1n der4; The said extension7 is recessed, as at 8, which communicates with an inlet-port 9, formed in the tailpiece 5, and to the inlet 9-is secured a nipple 10, to which is attached the motive-fluid or air supply pipe 11. The outer end of the tailpiece is pointed, as at 12, so that When the feeder is set up the pointed end of the tailpiece Will enter the round, thereby preventing the feeder from siipping. Operating within the cylinder 4, as well as being of such length as to project from one end of the cylinder 4, is an elongated piston 13,having the outer end thereof formed solid as at 14, and the said piston 13 is further rovided with an elongated channel 15, w ich communicates at one end with therecess 8 and at-its' other end with an outlet-port116,

in which is secured a nipple 17. The periph 9 5 cry of the piston '13 near its inner end is cut; away, as at 18, forming an annular shoulder 5 19, which constitutes an abutment to arrest the movement of the piston 13 out of the. cylinder. The shoulder 19 associates with a I00 locking device to be hereinafter referred to.

The piston l3'is furthermore rovided with a port 19, communicating with the channelv 15. The port 19 is arranged near the inner end of the piston 13, and the said port 19 05 causes when the piston is near the limit of its stroke in one direction the discharge of the air from the channel 15. such discharge caus- "the'members 31 IS an annular spring member ing a hissing sound and indicating to the operator that the piston 13 is near the limit its outward stroke. The port 19 also al- 'lows the escape of the air, so that the operator can readily move the piston 13 inwardly when the supply of fluid is .cut off from the recess 8. The cylinder 4 at that end opposite to-which the tailpiece is connected is pro.

vided with exterior screw-threads, and to the said exterior screw-threads is connected. a sleeve 20, having an inwardly-extending annular flange at a point intermediate its length, as at 21, its inner face beveled, as at 22, and

L its inner face further provided with a shoulyrs der, as at 23. The sleeve 20 is furthermore provided with exterior screw-threads with which engages a collar 24, havingone end formed with an inwardly-extending annular flange 25. Mounted against the flange and havin one end interposed between the end 26 of t 1e sleeve 20 and the piston 13 is a packing-gland 27, and interposed between i the end 26 of the sleeve 20 and the piston 13 is a packing-ring 28, and between the pack ing-ring and thegland 27 and surrounding the piston 13 is arranged a suitable packing 29. interposed between the shoulder 21 and the end of the cylinder 4 is a washer 30.

The locking device which associates with the shoulder 19 of the piston 13 consists of a plurality of shiftable segment-shaped memers 31, which are suitably spaced apart and surround the piston 13. Each of the membershas its periphery cut away to form a groove 32, and mounted in the grooves 32 of 33, whose tendency is to keep the members I 31 in close contact with the piston.

members 3lviare held in. close contact there- The members 31 are positioned within the sleeve 20 in proximity to the beveled portion 22 of the inner face of the sleeve 20. During the outward movement of the piston 13 the with,-and as the piston continues to move outwardly the members 33 will eventually engage the cut-away portion 18, and during the further movement of the piston in an outtempted to be carried outwardly .by the piston a wedglng action would take place, consequently arresting the movement of thepiston, as the sleeve 20 is fixed to the cylinder.

The reference character 34 denotes the cylinder of the hammer, which is -ieinfoiced, as

at 35, and the said einforced portion 35' is providedwith a screw-th eaded opening to receive the inner end. of a throttle-valvc casing 36. NVithin the casing 36 is positioned a manually-operated throttle-valve 37, which 4 connected thereto.

' inwardly bythe operator.

not on] acts .to close the channel 38 for establis ing communication between the valve-casing 36 and the interior'of the cylinder 34, but also acts as a means for closing the air-inlet 39, which is arranged in the side of the casing 36. The casing 36 has extending at right angles thereto a nipple 40, which communicates with the inlet 39, and secured to the nipple 40 is one end of a pipe connection 41. The other end of said connection-41 is secured to a T-coupling 42, which is secured to and communicates with the nipple 17.

The valve 37 is provided with an elongated stem 43, which projects from the vcasing36 and is provided with a finger or handle piece 44. Secured upon the end of the cylinder 34 r is a cap 45, which is interiorly screw-threaded and has the solid end 14 of the piston 14 A Washer 46 is interposed between the cap and the edge of the cylinder, so as to seal that end of the cylinder. A clamping-nut 47 is provided, so as to prevent separation of the piston 13 from the cap'45.

From the foregoing construction itwill be evident that when air is supplied through the tailpiece 5 to the cylinder 5' the piston 13 will be caused to move outwardly from the cylinder, pressing the tool against its work, and the air will also travel through the channel 15 and'be discharged at the outlet 15 into the T-coupling and pipe connection 41. From there it Will'he fed into the valve casing 36that is. to say, if the valve 37 is re moved from in front of the inlet 39. "If the valve is in such position, the. air will be supplied to the cylinder 34, and consequently reciprocate the hammer within the cylinder 34, thereby operating the tool. The valve 37 is shifted to open the inlet 39 in the chan nel 38 manuallythat is to say, the operator moving his hand outwardly along the casing 36 to engage the finger or handle piece 44, such action .will then shift the valve fromv closed position. As the piston 13 moves outwardly, the port 19 will eventually pass clear of the collar 25, and as the air exhausts from the channel 15'through the port 19 a hissing. sound will be had, which will indicate to the operator that the piston is near the limit of its outward stroke. A furthermovement of the piston outwardly will cause the members 31 to abut against the shoulder 19, thereby arresting any further movement of the piston in an outward direction. After the piston has been shifted by the air to the limit of its stroke in one direction the air-supply is cutoff, and the piston is then moved The air exhausting through theport -,19 will enable the oper ator to readily return the piston backintothe cylinder 4. Owing to the extending of the valvd-casing 36 at right angles with respect to the cylinder 34, the operatorcan turn the pneumatic tool by one hand in a convenient manner, and, furthermore, such I arrangement of the valve-casing 36 will prevent the flopping around of the air-hose, thereby preventing the tangling and wearing thereof, and at the same time it will be evident that the durabilityof the air-hose at the point of connection between one end thereof and the tailpiece will be increased. Then again, the manner of setting up the throttle valve will enable the operator to readily open and close the valve, when occasion requires, without the necessityof removing that hand which. is used to turn the cylinder of the hammer. a

- Owing the manner of setting up the piston with respect to the cylinder, the former is substantially of the same diameter as the inner diameter of the latter, making a snug fit but .17 the same time the fit is such as not to 'zcninterfere with the movement of the piston piston to normal position.

' bearing'for nearly its I cating with the tool for supplying a--mo tive fluid thereto and the other of ward stroke.

' type of feeders,

when feeding the tool or when returning the The inner diameter of the cylinder with respect to the diameter'of the piston is such that the piston hasfull bearing for nearly its entire length. In certain types of feeders now in use there is a bearing only at the end ofithe piston adjacent to the tailpiece and at 'the point where the piston projects from the end of the cylin der. here is considerable strain on this and with the arrangement ust mentioned they are apt to wear out at point of bearing, Such objectionable-feature is not present when setting up the feeder with. a piston and cylinder in accordance with this invention, as the'piston has full entire length.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

7 1. An automatic feeder for tools comprising a cylinder adapted-to be supported at one end, a fluid-operated piston within the cylinder and of a diameter as to snugly fit throughout its length the inner face of the cylinder, said piston connected at one end to the tool to be fed and having a channel terminating at a pointremoved from the oint of connection between the piston and the tool, said piston having its channel open at one end and further provided With a for the channel, one of said outlets communig the outlets allowing for the escape of motive iluidto the atmosphere so as to indicate to the operator i that the piston is near the limit of its-"out- 2 An automatic feeder for tools comprisl ing a'cylinder adapted to be sup orted at one end, a fluidoperated piston Wit n the cylinder and of a diameter as to snugly fit throughout its length the inner face of the cylinder, said piston connected at one end to the tool tobe fed and having a channel terminating 1 pair of outlets terminating at a point removed from the point of connection between the piston and the tool, said piston having its channel open at one end and further provided with a pair of outlets for, the channel, one of said outlets communicating l with the tool for supplying a motive fluid thereto and the other of the outlets allowing for the escape of motive fluid to the atmos phere so as to indicate to the operator that the piston is near the limit of 'its outward stroke, and shiftable means carriedlby' one end of the cylinder and adapted to','abut against the 'piston for arresting the outward movement thereof.

3. An automatic feeder for pneumatic I with a n1otive-fluid supply, a hollowpis ton arranged within the cylinder and connected, at one end to the tool to be fed, said piston provided with an outlet, an exteriorly-arranged pipe connection communicatingv at one end with said outlet and at its other end with the tool for supplyingmotivefluid.

4. An automatic feeder for pneumatic.

with a motive-fluid supply, a piston arrange within said cylinder-and provided with a channel extending from OIIG'GIld and termi- I' tools comprising a cylinder communicating tools comprising a cylinder communicating 1 'nating at a point removed fromthe other end- 1 of the piston, said piston with a pair of outlets for said channel communicating rior of the cylinder, one of said ed to communicate with the I allow of the escape of motive fluid-to indicate to an operator that the piston is near the said channel and outlets adaptlimit of its outward stroke, and an exteriorly I arranged pipe connection communicating with the other of said outlets and'withithe tool to be fed for supplying a motive to the tool. V 1 I 5. 'An automatic feeder for pneumatic tools comprising a cylinder communicating with a motive-fluid.

with a channel at a point removed from-the providednvith a With the inte atmosphere to v supply, a piston -ar ranged within said cylinder and provided extending from one end-and further provided other end of the piston, said piston further I pair of outlets for said chanev nel and said channel communicating i h interior of the cylinder, one of said outlets adapted to communicate with the atmosphere to allow'of the cate to an operator that the piston limit of its outward stroke, an eXteriorly-ar ranged pipe connection communicating with;

the other of said outlets and ,with the tool to be fed for'supplying a motive fluid and means connected to the cylinder and adapted to abut against the pistonto arrest the outward movement thereof.

to the tool,-

escape of motive fluid to indiis near the S with the other of said outlets and with the indicate to,an operator that the piston is near tools comprising tools comprising the limit of itsoutwa-rd stroke, an exteriorlyarranged pipe connectioncommunicating t'ool'to be fed for supplyin a motive fluid to the tool, and means carrier by one endof the cylinder and adapted to abut against the piston. for limiting the outward movement thereof, I

7. An automatic feeder for pneumatic a recessed tailpiececonnected with a, source of motive-fluid supply, acylinder, connected to said tailpiece, a vhollow piston operating and opening inzsaidcylinder and connected at one end to the tool to be fed, and an automatically-shiftable means engaging the piston forarresting the outward movement thereof.

8. An automatic feeder for pneumatic communicating with a motive-fluid supply, a

cylinder-connected to said tailpiece-and open-.

ing into said recess, a piston arranged within and of a diameter as tosnugly engage the inner face of the cylinder, said piston havin one end connected. to the tool to be fed an further provided with a channel opening at one end into the cylinder and. terminating at a point removed from that end of the piston connected tothe tool, said piston further rovided with anoutletfor said channehan an exteriorly-arranged meansv communicating with said-outlet and with the tool for supplying motive fluid to the latter.

9. An automatic feeder for pneumatic tools comprising a tailpiece having a recess communicating with a motive-fluid supply, a cylindercon'nected to said tailpiece and open- 'ing into-said recess, a piston arranged within and of a diameter as to snugly engage the inner face of the cylinder, said piston having one end connected to the tool tobe fed and further provided with a channel opening at one end into the cylinder and terminating at a point removed from that end of the piston connected to the tool, said piston further provided with an outlet for said channel, an exterrorly-arranged means communicating with said outlet and with the tool for supplying motive fluid to the latter,and an automatic ally-operable locking device engaging the piston for arresting the outward movement thereof. V v

a tailpiece having a recess gage said movement of the piston,the other of said out- 10. An automatic feederfor toolscomprising a cylinder supply a pistpn operating within said cylin; der and connnected with the tool to be fed,

and a spring-controlled locking device con-.

nected to one end of the cylinder and adaptsupported' at one end and communicating with a source of-motive-flurd;

ed to engage the piston to arrest the outward.

movement thereof.

11. An automatic feeder for tools com-' prising a cylinder supported at one end and communicating with a source of motive-fluid supply, a piston operated within said cylinder and having one end connected to the tool tobe fed, said piston having its periphery cut away to form a shoulder, and a .shiftable locking device connected to one end of the cylinderand adapted to engage the shoulder of the piston to arrest. the outward movement of the piston.

12. An automatic feeder for pneumatic tools comprising a cylinder supported at one end and communicating supply, a hollow piston operating within said cy inder and having a closed end connected to the tool to be fed, said iston further'provided with a peripheral s oulder, means for supplyin tool, an a spring-controlled locking device connected to the cylinder and adapted to engage said shoulder to arrest the outwardmovement of the piston.

13. An automatic feeder for pneumatic tools comprising a cend'and communicatingv with a motive-fluid supply, a hollow piston operating Within said cylinder and havin a closed end connected to the tool tobe fe. said piston further provided with a peripheral shoulder and a pair of outlets, means communicating with one of said outlets for supplying motive fluid from the piston to the tool, and a locking device connected to the cylinder. and adaptedto enshoulder to arrest the outward lets adapted to open into the atmosphere to cause an exhaust of motive fluid to indicate to'an operator when the piston is near the limit of its outward stroke V 14. An automatic feeder for tools comprising a hollow cylinder, a recessed tailpiece connected to" one end of the cylinder for supporting it and adapted to communicate with a source of motive-fluid supply, a pressure-operated piston within said' cylinder, having a bearing for-nearly i s entire length within the cylinder and adapted to be connected withvthe tool to be fed, and a shiftable locking device carried by the cylinder and adapted to-engage the piston to arrest the outward movement. thereof.

15. An automatic feeder for tools comprising the combination with a cylinder communicating with a source of motiverfluid supply and a pressure-operated piston within with a motive-fluid motive fluid from the piston to the linder supported at one IOO shoulder, of a plurality said cylinder, said piston having a, peri vh- 1 stops surrounding V eral shoulder, of a plurality of automation lyg be engaged by the peripheral shoulder of the shifteble stops surrounding the piston and ,5 piston to limit the outward movement thereadapted to be engaged by the peripheral l of, and means for inclosing the stops. shoulder of the, piston he outward In testimony whereof we have hereunto movement the fof, and means for inolosing set our hands in the stops. Witnesses.

16. An automatic feeder for tools com- I prising the combination with a cylinder communioeting With a source of motive fluidl supply and a pressure-operated piston Within i said cylinder, said piston having a peripheral of spring-controlled CHARLES TINGLEY OARNAHAN. JEREMIAH MURPHY.

, Witnesses:

H. S. PHILLIPS, LATIMER FoPLEss.

the piston and adapted tofl presence of two subscribing 

